Revert "driver core: synchronize device shutdown"
Revert "driver core: synchronize device shutdown"

This reverts commit 401097ea4b89846d66ac78f7f108d49c2e922d9c.  The
original changelog said:

    A patch series to make .shutdown execute asynchronously.  Some drivers's
    shutdown can take a lot of time.  The patches can help save some shutdown
    time.  The patches use Arjan's async API.

    This patch:

    synchronize all tasks submitted by .shutdown

However, I'm not able to find any evidence that any other patches from
this series were applied, nor am I able to find any async tasks that are
scheduled in a .shutdown context.

On the other hand, we see occasional hangs on shutdown that appear to be
caused by the async_synchronize_full() in device_shutdown() waiting
forever for the async probing in sd if a SCSI disk shows up at just the
wrong time — the system starts the probe, but begins shutting down and
tears down too much of the SCSI driver to finish the probe.

If we had any async shutdown tasks, I guess the right fix would be to
create a "shutdown" async domain and have device_shutdown() only wait
for that domain.  But since there apparently are no async shutdown
tasks, we can just revert the waiting.

Signed-off-by: Roland Dreier <0d270388f2f92757a5de0f4bd891d3b392c44c4f@purestorage.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs